• Responding to email notices you receive.
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  • IMPORTANT! PLEASE READ!! About the Google Adsense ads being displayed

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    Posted 08/15/2025
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    Yeah, I know. They are a pain in the butt. But they pay the bills to keep my server running. Just a fact of life, I am afraid.

    Want to get rid of them? Simple. Just become a Contributor level member or above and they will be gone. -> Please click HERE."

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    Google Adsense ad revenue for December, 2025 was just $30 over the cost of the lease for the server running this site. So, in effect, the money providing the incentive for me to continue running this site is coming SOLELY from the paid memberships and sponsorships here. Which honestly ain't much....

How long does Chlorhexidine disinfectant last?

I don't know the exact timings, but it is true that it has a limited lifespan once diluted, so it's better to store the concentrate and only make it up as needed.
 
The expiration date should be listed on the bottle. Depending on where it is purchased, you should have at least 2 yrs...but I have received a bottle with only 8 months to expiration (needless to say, I no longer use that source).
Once diluted, off the top of my head, I believe it is good for 1 week if tap water is used; 1 month if distilled water. It should also be noted that the effectiveness is decreased in the presence of detergents or "waste"; so you should clean first, then disinfect.
Relatively few bacteria are killed with a spray and wipe technique...wet time is essential, typically 5-10 minutes (depending on what you are trying to kill). Spray, let it sit, then wipe it dry.
 
hhmoore said:
The expiration date should be listed on the bottle. Depending on where it is purchased, you should have at least 2 yrs...but I have received a bottle with only 8 months to expiration (needless to say, I no longer use that source).
Once diluted, off the top of my head, I believe it is good for 1 week if tap water is used; 1 month if distilled water. It should also be noted that the effectiveness is decreased in the presence of detergents or "waste"; so you should clean first, then disinfect.
Relatively few bacteria are killed with a spray and wipe technique...wet time is essential, typically 5-10 minutes (depending on what you are trying to kill). Spray, let it sit, then wipe it dry.
Click to expand...

Great info Harald. I have also read that light shortens the life span. Is that true? I keep mine in a dark cabinet till its time to use it. Also when cleaning, I spray all the tubs and let them sit for atleast 10 mins.
 
The date should be on the bottle of the disinfectant. Another thing to keep in mind, the chlorhexidine activity is dependent on pH and is weaker in the presence of organic matter so for some chemicals it will be stronger or more effective than others.
 
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